Estimated daily intake of phenolics and antioxidants from green tea consumption in the Korean diet

Abstract

To estimate daily intake of total phenolics and flavonoids from green tea and the contribution of green tea to the antioxidant intake from the Korean diet, 24 commercial brands of green tea were selected and analyzed. Data from the Korea National Health and Nutrition Examination Survey (KNHANES) from 2008 and 2011 indicate that the green tea consumption in these 2 years was 2.8 g/tea drinker/day and 2.9 g/tea drinker/day, respectively. Based on data derived from direct measurements of green tea phenolics and the dataset of the 2008 KNHANES, we estimated the daily per tea drinker phenolics intake to be 172 mg gallic acid equivalents (GAE), the total flavonoids to be 43 mg catechin equivalents (CE) and the total antioxidants to be 267 mg vitamin C equivalents (VCE; 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay) and 401 mg VCE (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) assay). In 2011, we estimated the daily per tea drinker total phenolics intake to be 246 mg GAE, the total flavonoids to be 60 mg CE and the antioxidants to be 448 mg VCE (DPPH assay) and 630 mg VCE (ABTS assay). The daily intake of total phenolics, total flavonoids and antioxidants from green tea consumption increased from 2008 to 2011.

Comparison and correlation analysis of flavonoids and chlorogenic acid contents in different strains of Acer truncatum

“…Therefore, the actual content of TFC should be lower than that indicated by our data. However, using the same method used in our study, Lee et al (2016) and Bizuayehu et al (2016) determined the TFC in green tea and obtained highly similar results (2320 and 2340 mg catechin equivalent/100 g, respectively). Ot could be concluded that the total flavonoids in ATLs (mg/100 g) were similar to those in green tea and that ATLs were suitable for processing green tea for drinking.…”

Green Tea, Coffee, and Caffeine Consumption Are Inversely Associated with Self-Report Lifetime Depression in the Korean Population

“…In Japan, 53% of adults consume green tea on a daily basis [ 6 ], and in China, 46.1% of adults regularly drink tea [ 13 ]. In Korea, green tea consumption was 2.9 g/tea drinker/day in 2016 [ 14 ]. Recent data have indicated that coffee intake is rapidly increasing in the Korean population.…”

The use of natural ingredients in innovative Korean cosmeceuticals

“…In the Korean National Health and Nutrition Examination Survey (KNHANES), researchers examined how much green tea Koreans consumed per day. Over a period of 3 years, Koreans increased their green tea intake from 2.8 to 2.9 grams/tea drinker/day equating to 172‐246 mg gallic acid equivalents, 43‐60 mg catechin equivalents, and 267‐448 mg vitamin C equivalents by the 1,1‐diphenyl‐2‐picrylhydrazyl assay or 401‐630 mg vitamin C equivalents by the 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonic acid) diammonium salt assay …”